Tungsten tetrabromide (WBr4) has redox ability, because the valence of tungsten atoms in it can change. In chemical reactions, tungsten atoms can switch between different valences, thus acting as an oxidizing or reducing agent.
The most common valence of the tungsten atom in tungsten tetrabromide is +4, which means that its electron configuration is [Kr]4d^10. However, tungsten atoms can accept or donate electrons to change their valence. When tungsten tetrabromide reacts with other compounds, tungsten atoms can lose electrons and be reduced, or can accept electrons and be oxidized.
For example, the tungsten atom of tungsten tetrabromide can accept electrons when reacting with a reducing agent, thereby reducing its valency. This allows other species to be oxidized while tungsten tetrabromide is reduced.
On the other hand, when reacting with an oxidizing agent, the tungsten atom of tungsten tetrabromide can donate electrons to increase its valence. This causes other species to be reduced while tungsten tetrabromide is oxidized.
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